Black Box 5000 - Manual (Page 165)

CHAPTER 12: Diagnostics
163
12.5 Testing the Network
In a Multiserver network, there are several loopback
and test-pattern tests that you can use to diagnose
the integrity of various segments of the network.
The modules in a Multiserver have diagnostic tests
initiated by those units; detailed information on
each of those tests is in the individual module
manuals. The following information is important to
note when attempting to invoke a diagnostic loop
for async data channels with
• an integral CSU/DSU,
• standalone CSU/DSU and modems,
• telco loops,
• link remote loops.
T ESTING A C ONNECTED A SYNC P ORT ( WITH NO
I NTEGRAL CSU/DSU)
1. Log into the Command Mode and access the
Async Channel Loopback test (option 1).
2. You may do either one of the following setups:
a. • Select a remote echo test (option 2).
• Attach an async tester (i.e., a BERT) to
the async port initiating the test.
• Type in some data. All data entered
should be received on your display.
or
b. Select the remote fox (option 4). The
message is automatically sent. It will be
received and displayed.
T ESTING AN A SYNC P ORT (N OT C ONNECTED , WITH NO
I NTEGRAL D EVICES L OOPED )
1. Log into the Command Facility Main Menu,
Diagnostics (option 7). Select Link Channel
Loopback (option 2). You will be promped
for the link.
2. You may do either one of the following setups:
a. • Select the remote echo (option 2).
• Attach an async tester (i.e., a BERT) to
the async port initiating the test.
• Type in some data. All data entered
should be received on your display.
or
b. Select the remote fox (option 4). The
message is automatically sent. It should be
received and displayed.
L OCAL L OOP C ONDITIONS FOR T ESTING THE I NTEGRAL
CSU/DSU
(A
SYNC C HANNEL IS NOT F ORCE -C ONNECTED )
Note
• This test will interrupt normal
operation over the link.
1. Log into the Command Facility Main Menu,
Diagnostics (option 7). Select Integral Device
(option 6) and the desired loopback (option
numbers depend on device installed).
2. At the Diagnostics Menu, select Link Channel
Loopback (option 2) and the module
location/channel number of the integral
device.